Comet C/2012 S1 (ISON) - Update 2012, Oct. 4

Stacking of 9 exposures, 120 seconds each, produced an image where a well developed and elongated coma measuring nearly 6"x9" is now visible, extended toward PA 280 deg. Click on the image below for a bigger version.

From this stacking, the Afrho parameter was determined to be about 1530 +/- 150 cm (see panel below). The total magnitude has been measured as R= 17.7. Click on the image below for a bigger version.

For more info about comet C/2012 S1 (ISON) please see our previous post:

Comets & Asteroids news

Welcome to our Astronomy blog, devoted in particular to Comets & Asteroids and related topics. This blog is maintained by Italian amateur astronomer Ernesto Guido, particularly active in the study of the small bodies of the Solar System.